To make it easier on you , all 10 bolts use the same size carrier for any gear ratio , and posi's were never installed up front from what we have observed documented .
The difference is a posi carrier is designed to hold a spring and clucth pack , or other locking device , and an open carrier just holds the spider gears that allow it to be a "differential" . An open carrier allows economical locker such as the lockright to be installed easily .
It would be a great idea if you are able to afford the complete overhaul , all hard parts and soft parts that wear out , I.E seals , bearings and such .
Although a front does see less use as a rear . I just regeared mine with only used gears , bearings , and the only new parts were the seals and the leftover gear marking compund from the rear . I got a good pattern on the first try using the old gear setup from the axle I took the gears out of .
Good luck , and post some pics of the truck when you finish
